Process for producing expanded polyolefin resin particles and expanded polyolefin resin particles
US9018269B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2013 |
| Grant date | Apr 28, 2015 |
| Priority date | — |
| Expiry date | Sep 14, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for producing expanded polyolefin resin particles with use as a foaming agent of water contained in an aqueous dispersion medium. The process includes dispersing polyolefin resin particles together with the aqueous dispersion medium into a closed vessel; heating the polyolefin resin particles up to or above a softening temperature of the polyolefin resin particles and pressurizing the polyolefin resin particles; and releasing the polyolefin resin particles into a zone whose pressure is lower than an internal pressure of the closed vessel. The polyolefin resin particles are composed of a polyolefin resin composition including polyolefin resin, polyvalent alcohol and a foam nucleating agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.